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The Earth is made up of a thin crust of cool hardened rock that floats on a huge ball of of molten to semi-molten rock. This crust is broken up into multiple large parts called tectonic plates. The molten rock underneath undergoes "convection", like a slow boil, that causes the plates to shift on the surface. This happens extremely slowly at a rate of about a few centimeters per year.
When these plates move away from each other, they create gaps or trenches. There are many notable examples of these trenches, for example, the Mariana Trench as well as the trenches that were so useful to the allied forces during the various world wars where they would take cover from enemy artillery.
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Where are deep oceanic trenches found?
Trenches occur at convergent boundaries when one tectonic plate which is more dense, is pushed beneath another tectonic plate that is less dense. This process is called subduction. Usually where divergent boundaries in the earth's crust are. When faults move apart, they create trenches.<-- no divergent boundaries in the ocean create mountain ridges not trenches http://upload.wikimedia.org/wikipedia/en/a/a4/SubZone.jpg
What landforms can form independent of plate boundaries?
Some landforms that can form independent of plate boundaries include volcanoes that form over hot spots in the middle of plates, rift valleys that form at divergent boundaries within plates, and dome mountains that form from uplift and erosion processes.
Collision boundaries and subduction boundaries are types of what boundaries?
The older denser plate sinks under a deep ocean trench into the mantle. Some rock above the subducting plate melts and forms magma. Since the magma is less dense than the surrounding rock, it rises toward the surface. Eventually, the magma breaks through the ocean floor, making a volcanoe.
Why most mountains form near plate boundaries?
Transform, Divergent, and Convergent
What crustal features are found at each type of plate boundary?
At a destructive or convergent plate boundary, you will often find volcanoes, though a little way away from the actual boundary. Earthquakes will be common. At a constructive or divergent plate boundary, you will often find either a trench or a small ridge going along the boundary. At a conservative plate boundary, there are very few features to be seen, save for the large crack in the ground. Sometimes there can be some cliff forming at the fault line. Earthquakes are very common. At a collision plate boundary, large fold mountains will be formed.
What boundary do subduction zones form on?
Subduction zones form along some tectonic plate boundaries. Of the three general types of tectonic plate boundaries, we will see them form at some (but not all) of what are called convergent plate boundaries.
Where are deep oceanic trenches found?
Trenches occur at convergent boundaries when one tectonic plate which is more dense, is pushed beneath another tectonic plate that is less dense. This process is called subduction. Usually where divergent boundaries in the earth's crust are. When faults move apart, they create trenches.<-- no divergent boundaries in the ocean create mountain ridges not trenches http://upload.wikimedia.org/wikipedia/en/a/a4/SubZone.jpg
What landforms can form independent of plate boundaries?
Some landforms that can form independent of plate boundaries include volcanoes that form over hot spots in the middle of plates, rift valleys that form at divergent boundaries within plates, and dome mountains that form from uplift and erosion processes.
Does island have a lot of volcanoes because it is on the boundary of two plates?
Many volcanic islands are a product of plate boundaries, but some, such as the Hawaiian islands, form over hot spots away from plate boundaries.
Why are most volcanoes located near a fault?
Most volcanoes form at either convergent or divergent plate boundaries. Volcanoes at convergent plate boundaries form when one plate slides under another, taking seawater with it. This causes the rock in the mantle to melt as the melting point drops. This new magma can rise to form volcanoes.At divergent plate boundaries the crust is thing, which lowers pressure on the mantle, causing some material to melt.
Collision boundaries and subduction boundaries are types of what boundaries?
The older denser plate sinks under a deep ocean trench into the mantle. Some rock above the subducting plate melts and forms magma. Since the magma is less dense than the surrounding rock, it rises toward the surface. Eventually, the magma breaks through the ocean floor, making a volcanoe.
Where do volcanes erupt?
Along some plate boundaries.
Where most volcanoes are located compared to where plate boundaries are located?
Most volcanoes are located along tectonic plate boundaries, particularly at convergent and divergent boundaries. At convergent boundaries, one plate subducts beneath another, leading to magma formation and volcanic activity. At divergent boundaries, plates pull apart, allowing magma to rise and create new crust, often resulting in volcanic eruptions. Additionally, some volcanoes, known as hotspot volcanoes, can form away from plate boundaries due to mantle plumes.
Why most mountains form near plate boundaries?
Transform, Divergent, and Convergent
What crustal features are found at each type of plate boundary?
At a destructive or convergent plate boundary, you will often find volcanoes, though a little way away from the actual boundary. Earthquakes will be common. At a constructive or divergent plate boundary, you will often find either a trench or a small ridge going along the boundary. At a conservative plate boundary, there are very few features to be seen, save for the large crack in the ground. Sometimes there can be some cliff forming at the fault line. Earthquakes are very common. At a collision plate boundary, large fold mountains will be formed.
Are the plate boundaries the same as the edges of continents?
No. Not all plate boundaries are at the edges of continents, nor do all edges of continents correspond with plate boundaries. Many plate boundaries are found in the middle of oceans, while the continent of Africa is being torn apart by a developing plate boundary. Some edges of continents, such as the west coast of South America are near plate boundaries. These are called active continental margins. Others, such as the east coast of North America, are nowhere near plate boundaries. These are called passive continental margins.
Where are the most plate bounderies?
Fault lines.
